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<?php
namespace Code_Snippets\Settings;
use Plugin_Upgrader;
use WP_Ajax_Upgrader_Skin;
use WP_Error;
use WP_Upgrader_Skin;
use function Code_Snippets\code_snippets;
/**
* Version switching functionality for the Code Snippets plugin.
*
* @package Code_Snippets
* @subpackage Settings
*/
class Version_Switch {
/**
* Transient key where the available version data is cached.
*/
private const CACHE_KEY = 'code_snippets_available_versions';
/**
* Transient key used to indicate when a version switch is currently taking place.
*/
private const PROGRESS_KEY = 'code_snippets_version_switch_progress';
/**
* Duration of the version cache transient.
*/
private const VERSION_CACHE_DURATION = HOUR_IN_SECONDS;
/**
* Duration of the 'in progress' transient.
*/
private const PROGRESS_TIMEOUT = 5 * MINUTE_IN_SECONDS;
/**
* API endpoint for checking for available plugin versions.
*/
private const WORDPRESS_API_ENDPOINT = 'https://api.wordpress.org/plugins/info/1.2/?action=plugin_information&slug=code-snippets';
/**
* Initialise class.
*
* @return void
*/
public static function init(): void {
add_action( 'wp_ajax_code_snippets_switch_version', [ __CLASS__, 'ajax_switch_version' ] );
add_action( 'wp_ajax_code_snippets_refresh_versions', [ __CLASS__, 'ajax_refresh_versions' ] );
}
/**
* Retrieve a list of plugin versions available for switching.
*
* @return array
*/
public static function get_available_versions(): array {
$versions = get_transient( self::CACHE_KEY );
if ( false === $versions ) {
$response = wp_remote_get( self::WORDPRESS_API_ENDPOINT );
if ( is_wp_error( $response ) ) {
return [];
}
$body = wp_remote_retrieve_body( $response );
$data = json_decode( $body, true );
if ( ! $data || ! isset( $data['versions'] ) ) {
return [];
}
// Filter out 'trunk' and sort versions.
$versions = [];
foreach ( $data['versions'] as $version => $download_url ) {
if ( 'trunk' !== $version ) {
$versions[] = [
'version' => $version,
'url' => $download_url,
];
}
}
// Sort versions in descending order.
usort(
$versions,
function ( $a, $b ) {
return version_compare( $b['version'], $a['version'] );
}
);
// Cache for configured duration.
set_transient( self::CACHE_KEY, $versions, self::VERSION_CACHE_DURATION );
}
return $versions;
}
/**
* Retrieve the current plugin version.
*
* @return string
*/
public static function get_current_version(): string {
return defined( 'CODE_SNIPPETS_VERSION' ) ? CODE_SNIPPETS_VERSION : '0.0.0';
}
/**
* Determine if a version switch is currently taking place.
*
* @return bool
*/
public static function is_version_switch_in_progress(): bool {
return get_transient( self::PROGRESS_KEY ) !== false;
}
/**
* Purge transient data associated with this class.
*
* @return void
*/
public static function clear_version_caches(): void {
delete_transient( self::CACHE_KEY );
delete_transient( self::PROGRESS_KEY );
}
/**
* Validate that a target version is valid.
*
* @param string $target_version Target version for switching.
* @param array $available_versions List of available versions.
*
* @return array
*/
public static function validate_target_version( string $target_version, array $available_versions ): array {
if ( empty( $target_version ) ) {
return [
'success' => false,
'message' => __( 'No target version specified.', 'code-snippets' ),
'download_url' => '',
];
}
foreach ( $available_versions as $version_info ) {
if ( $version_info['version'] === $target_version ) {
return [
'success' => true,
'message' => '',
'download_url' => $version_info['url'],
];
}
}
return [
'success' => false,
'message' => __( 'Invalid version specified.', 'code-snippets' ),
'download_url' => '',
];
}
/**
* Create a response indicating an error occurred.
*
* @param string $message Error message.
* @param string $technical_details Additional details.
*
* @return array
*
* phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_error_log
*/
public static function create_error_response( string $message, string $technical_details = '' ): array {
if ( ! empty( $technical_details ) ) {
if ( function_exists( 'error_log' ) ) {
error_log( sprintf( 'Code Snippets version switch error: %s. Details: %s', $message, $technical_details ) );
}
}
return [
'success' => false,
'message' => $message,
];
}
/**
* Install a plugin version from a URL.
*
* @param string $download_url Download URL.
*
* @return array|bool|WP_Error
*/
public static function perform_version_install( string $download_url ) {
if ( ! function_exists( 'wp_update_plugins' ) ) {
require_once ABSPATH . 'wp-admin/includes/update.php';
}
if ( ! function_exists( 'show_message' ) ) {
require_once ABSPATH . 'wp-admin/includes/misc.php';
}
if ( ! class_exists( 'Plugin_Upgrader' ) ) {
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
}
$update_handler = new WP_Ajax_Upgrader_Skin();
$upgrader = new Plugin_Upgrader( $update_handler );
global $code_snippets_last_update_handler, $code_snippets_last_upgrader;
$code_snippets_last_update_handler = $update_handler;
$code_snippets_last_upgrader = $upgrader;
return $upgrader->install(
$download_url,
[
'overwrite_package' => true,
'clear_update_cache' => true,
]
);
}
/**
* Extract error message from an upgrade handler.
*
* @param WP_Upgrader_Skin|null $update_handler Update handler.
* @param Plugin_Upgrader|null $upgrader Plugin upgrader.
*
* @return string
*
* phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_print_r
*/
public static function extract_handler_messages( ?WP_Upgrader_Skin $update_handler, ?Plugin_Upgrader $upgrader ): string {
$handler_messages = '';
if ( isset( $update_handler ) ) {
if ( method_exists( $update_handler, 'get_errors' ) ) {
$errs = $update_handler->get_errors();
if ( $errs instanceof WP_Error && $errs->has_errors() ) {
$handler_messages .= implode( "\n", $errs->get_error_messages() );
}
}
if ( method_exists( $update_handler, 'get_error_messages' ) ) {
$em = $update_handler->get_error_messages();
if ( $em ) {
$handler_messages .= "\n" . $em;
}
}
if ( method_exists( $update_handler, 'get_upgrade_messages' ) ) {
$upgrade_msgs = $update_handler->get_upgrade_messages();
if ( is_array( $upgrade_msgs ) ) {
$handler_messages .= "\n" . implode( "\n", $upgrade_msgs );
} elseif ( $upgrade_msgs ) {
$handler_messages .= "\n" . $upgrade_msgs;
}
}
}
if ( empty( $handler_messages ) && isset( $upgrader->result ) ) {
if ( is_wp_error( $upgrader->result ) ) {
$handler_messages = implode( "\n", $upgrader->result->get_error_messages() );
} else {
$handler_messages = is_scalar( $upgrader->result )
? (string) $upgrader->result
: print_r( $upgrader->result, true );
}
}
return trim( $handler_messages );
}
/**
* Report the failure of a version switch attempt.
*
* @param string $target_version Version number of attempted upgrade.
* @param mixed $result Result of upgrade.
* @param string $details Additional details.
*
* @return void
*
* phpcs:disable WordPress.PHP.DevelopmentFunctions
*/
private static function log_version_switch_attempt( string $target_version, $result, string $details = '' ): void {
if ( function_exists( 'error_log' ) ) {
error_log( sprintf( 'Code Snippets version switch failed. target=%s, result=%s, details=%s', $target_version, var_export( $result, true ), $details ) );
}
}
/**
* Handle the failure to install a new version.
*
* @param string $target_version Version used for attempted installation.
* @param string $download_url URL used for downloading new version.
* @param mixed $install_result Result of installation attempt.
*
* @return array
*/
private static function handle_installation_failure( string $target_version, string $download_url, $install_result ): array {
global $code_snippets_last_update_handler, $code_snippets_last_upgrader;
$handler_messages = self::extract_handler_messages( $code_snippets_last_update_handler, $code_snippets_last_upgrader );
self::log_version_switch_attempt( $target_version, $install_result, "URL: $download_url, Messages: $handler_messages" );
$fallback_message = __( 'Failed to switch versions. Please try again.', 'code-snippets' );
if ( ! empty( $handler_messages ) ) {
$short = wp_trim_words( wp_strip_all_tags( $handler_messages ), 40 );
$fallback_message = sprintf( '%s %s', $fallback_message, $short );
}
return [
'success' => false,
'message' => $fallback_message,
];
}
/**
* Handle switching to a different plugin version.
*
* @param string $target_version Target version to switch to.
*
* @return array Result data.
*/
public static function handle_version_switch( string $target_version ): array {
if ( ! current_user_can( 'update_plugins' ) ) {
return self::create_error_response( __( 'You do not have permission to update plugins.', 'code-snippets' ) );
}
$available_versions = self::get_available_versions();
$validation = self::validate_target_version( $target_version, $available_versions );
if ( ! $validation['success'] ) {
return self::create_error_response( $validation['message'] );
}
if ( self::get_current_version() === $target_version ) {
return self::create_error_response( __( 'Already on the specified version.', 'code-snippets' ) );
}
set_transient( self::PROGRESS_KEY, $target_version, self::PROGRESS_TIMEOUT );
$install_result = self::perform_version_install( $validation['download_url'] );
delete_transient( self::PROGRESS_KEY );
if ( is_wp_error( $install_result ) ) {
return self::create_error_response( $install_result->get_error_message() );
}
if ( $install_result ) {
delete_transient( self::CACHE_KEY );
// translators: %s: new version number.
$message = esc_html__( 'Successfully switched to version %s. Please refresh the page to see changes.', 'code-snippets' );
return [
'success' => true,
'message' => sprintf( $message, $target_version ),
];
} else {
return self::handle_installation_failure( $target_version, $validation['download_url'], $install_result );
}
}
/**
* Render settings page field for the version switcher.
*
* @return void
*/
public static function render_version_switch_field(): void {
$current_version = self::get_current_version();
$available_versions = self::get_available_versions();
$is_switching = self::is_version_switch_in_progress();
?>
<div class="code-snippets-version-switch">
<p>
<strong><?php esc_html_e( 'Current Version:', 'code-snippets' ); ?></strong>
<span class="current-version"><?php echo esc_html( $current_version ); ?></span>
</p>
<?php if ( $is_switching ) : ?>
<div class="notice code-snippets-notice notice-info inline">
<p><?php esc_html_e( 'Version switch in progress. Please wait…', 'code-snippets' ); ?></p>
</div>
<?php else : ?>
<p>
<label for="target_version">
<?php esc_html_e( 'Switch to Version:', 'code-snippets' ); ?>
</label>
<select id="target_version" name="target_version" <?php disabled( empty( $available_versions ) ); ?>>
<option value=""><?php esc_html_e( 'Select a version…', 'code-snippets' ); ?></option>
<?php foreach ( $available_versions as $version_info ) { ?>
<option value="<?php echo esc_attr( $version_info['version'] ); ?>"
<?php selected( $version_info['version'], $current_version ); ?>>
<?php
echo esc_html( $version_info['version'] );
if ( $version_info['version'] === $current_version ) {
esc_html_e( ' (Current)', 'code-snippets' );
}
?>
</option>
<?php } ?>
</select>
</p>
<p>
<button type="button" id="switch-version-btn" class="button button-secondary" disabled
<?php disabled( empty( $available_versions ) ); ?>>
<?php esc_html_e( 'Switch Version', 'code-snippets' ); ?>
</button>
</p>
<div id="version-switch-result" class="notice code-snippets-notice" style="display: none;"></div>
<?php endif; ?>
</div><?php
}
/**
* Handle version switching through AJAX.
*
* @return void
*/
public static function ajax_switch_version(): void {
check_ajax_referer( 'code_snippets_version_switch', sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ) );
if ( ! current_user_can( 'update_plugins' ) ) {
wp_send_json_error( [ 'message' => __( 'You do not have permission to update plugins.', 'code-snippets' ) ] );
}
$target_version = sanitize_text_field( wp_unslash( $_POST['target_version'] ?? '' ) );
if ( empty( $target_version ) ) {
wp_send_json_error( [ 'message' => __( 'No target version specified.', 'code-snippets' ) ] );
}
$result = self::handle_version_switch( $target_version );
if ( $result['success'] ) {
wp_send_json_success( $result );
} else {
wp_send_json_error( $result );
}
}
/**
* Render settings page field for the refresh version button.
*
* @return void
*/
public static function render_refresh_versions_field(): void {
printf(
'<button type="button" id="refresh-versions-btn" class="button button-secondary">%s</button>',
esc_html__( 'Refresh Available Versions', 'code-snippets' )
);
printf(
'<p class="description">%s</p>',
esc_html__( 'Check for the latest available plugin versions from WordPress.org.', 'code-snippets' )
);
}
/**
* AJAX handler for refreshing the installed version.
*
* @return void
*/
public static function ajax_refresh_versions(): void {
check_ajax_referer( 'code_snippets_refresh_versions', sanitize_text_field( wp_unslash( $_POST['nonce'] ?? '' ) ) );
if ( ! code_snippets()->current_user_can() ) {
wp_send_json_error( [ 'message' => __( 'You do not have permission to manage options.', 'code-snippets' ) ] );
}
delete_transient( self::CACHE_KEY );
self::get_available_versions();
wp_send_json_success( [ 'message' => __( 'Available versions updated successfully.', 'code-snippets' ) ] );
}
/**
* Render warning notice.
*
* @return void
*/
public static function render_version_switch_warning(): void {
?>
<div id="version-switch-warning" class="notice code-snippets-notice notice-warning hidden" role="region">
<p>
<strong><?php esc_html_e( 'Warning:', 'code-snippets' ); ?></strong>
<?php esc_html_e( 'Switching versions may cause compatibility issues. Always backup your site before switching versions.', 'code-snippets' ); ?>
</p>
</div>
<?php
}
}